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1. A group or set of four.
2. A tetravalent atom, radical, or element.
3. Biology
a. A four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.
b. A group of four haploid cells, such as spores, formed by meiotic division of one mother cell.

[Greek tetras, tetrad-; see kwetwer- in Indo-European roots.]

te·trad′ic adj.


relating to something that has a group of four
References in periodicals archive ?
Wayne Constantineau and Eric McLuhan's Human Equation describes a tetradic instrument that offers insights into how the four pillars described in the Action Plan interact.
Powers, The Global Village: Transformations in World Life and Media in the 21st Century (New York: Oxford University Press, 1992): see the tetradic glossary, pp.
This is no more than we should expect if we take seriously the natural extension, illustrated below, of Popper's famous tetradic scheme (1972, Chapter 6, [section]xviii, theses 7f.
According to Glavaneu (2010), in the cultural tetradic framework of creativity new artefact (creation) emerges within the relationship between self (creator) and other (community), whereas all three of them are in dialogue with the existing artefacts (culture), i.
The logic of coalition formation could be further applied on a tetradic level, for example with two allied suppliers interacting with two allied buyers.
14) Teresa Soufas states that, "The roots of humoral theory itself can be traced to Pythagorean philosophy and its insistence upon tetradic categories of time and natural elements" (5).
De Armas sees a tetradic organization in Cervantes's narrative that implies a creative connection with Raphael's frescoes.
A tetradic analysis of GIS and society using McLuhan's law of the media.